#define _CRT_SECURE_NO_WARNINGS 1
#include <iostream>
#include <vector>
using namespace std;

int main()
{
    int n = 0;
    cin >> n;
    vector<int> dp(n + 1, 0);
    dp[1] = 1;
    int sum = 2;
    for (int i = 2;i <= n;i++)
    {
        dp[i] = sum;
        sum *= 2;
    }
    cout << dp[n] << endl;
    return 0;
}